324 lines
8.1 KiB
C
324 lines
8.1 KiB
C
/*
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* Copyright (c) 2011, Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/**
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* \author
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* Niclas Finne <nfi@sics.se>
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* Joakim Eriksson <joakime@sics.se>
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*/
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#include "net/ipv6/uip.h"
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#include "net/ipv6/uip-ds6.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <string.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <termios.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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/* Log configuration */
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#include "sys/log.h"
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#define LOG_MODULE "Tun6"
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#define LOG_LEVEL LOG_LEVEL_WARN
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#ifdef linux
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#include <linux/if.h>
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#include <linux/if_tun.h>
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#endif
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#include <err.h>
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#include "net/netstack.h"
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#include "net/packetbuf.h"
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static const char *config_ipaddr = "fd00::1/64";
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/* Allocate some bytes in RAM and copy the string */
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static char config_tundev[64] = "tun0";
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#ifndef __CYGWIN__
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static int tunfd = -1;
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static int set_fd(fd_set *rset, fd_set *wset);
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static void handle_fd(fd_set *rset, fd_set *wset);
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static const struct select_callback tun_select_callback = {
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set_fd,
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handle_fd
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};
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#endif /* __CYGWIN__ */
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static int ssystem(const char *fmt, ...)
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__attribute__((__format__ (__printf__, 1, 2)));
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static int
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ssystem(const char *fmt, ...) __attribute__((__format__ (__printf__, 1, 2)));
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int
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static ssystem(const char *fmt, ...)
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{
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char cmd[128];
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va_list ap;
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va_start(ap, fmt);
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vsnprintf(cmd, sizeof(cmd), fmt, ap);
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va_end(ap);
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LOG_INFO("%s\n", cmd);
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fflush(stdout);
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return system(cmd);
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}
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/*---------------------------------------------------------------------------*/
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static void
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cleanup(void)
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{
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ssystem("ifconfig %s down", config_tundev);
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#ifndef linux
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ssystem("sysctl -w net.ipv6.conf.all.forwarding=1");
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#endif
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ssystem("netstat -nr"
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" | awk '{ if ($2 == \"%s\") print \"route delete -net \"$1; }'"
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" | sh",
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config_tundev);
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}
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/*---------------------------------------------------------------------------*/
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static void
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sigcleanup(int signo)
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{
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fprintf(stderr, "signal %d\n", signo);
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exit(0); /* exit(0) will call cleanup() */
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}
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/*---------------------------------------------------------------------------*/
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static void
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ifconf(const char *tundev, const char *ipaddr)
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{
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#ifdef linux
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ssystem("ifconfig %s inet `hostname` up", tundev);
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ssystem("ifconfig %s add %s", tundev, ipaddr);
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#elif defined(__APPLE__)
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ssystem("ifconfig %s inet6 %s up", tundev, ipaddr);
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ssystem("sysctl -w net.inet.ip.forwarding=1");
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#else
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ssystem("ifconfig %s inet `hostname` %s up", tundev, ipaddr);
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ssystem("sysctl -w net.inet.ip.forwarding=1");
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#endif /* !linux */
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/* Print the configuration to the console. */
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ssystem("ifconfig %s\n", tundev);
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}
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/*---------------------------------------------------------------------------*/
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#ifdef linux
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static int
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tun_alloc(char *dev)
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{
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struct ifreq ifr;
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int fd, err;
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LOG_INFO("Opening: %s\n", dev);
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if( (fd = open("/dev/net/tun", O_RDWR)) < 0 ) {
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/* Error message handled by caller */
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return -1;
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}
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memset(&ifr, 0, sizeof(ifr));
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/* Flags: IFF_TUN - TUN device (no Ethernet headers)
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* IFF_NO_PI - Do not provide packet information
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*/
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ifr.ifr_flags = IFF_TUN | IFF_NO_PI;
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if(*dev != 0) {
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strncpy(ifr.ifr_name, dev, IFNAMSIZ);
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}
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if((err = ioctl(fd, TUNSETIFF, (void *) &ifr)) < 0 ) {
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/* Error message handled by caller */
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close(fd);
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return err;
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}
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LOG_INFO("Using '%s' vs '%s'\n", dev, ifr.ifr_name);
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strncpy(dev, ifr.ifr_name, strlen(dev));
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LOG_INFO("Using %s\n", dev);
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return fd;
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}
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#else
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static int
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devopen(const char *dev, int flags)
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{
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char t[32];
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strcpy(t, "/dev/");
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strncat(t, dev, sizeof(t) - 5);
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return open(t, flags);
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}
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/*---------------------------------------------------------------------------*/
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static int
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tun_alloc(char *dev)
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{
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LOG_INFO("Opening: %s\n", dev);
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return devopen(dev, O_RDWR);
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}
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#endif
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#ifdef __CYGWIN__
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/*wpcap process is used to connect to host interface */
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static void
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tun_init()
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{
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setvbuf(stdout, NULL, _IOLBF, 0); /* Line buffered output. */
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}
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#else
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/*---------------------------------------------------------------------------*/
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static void
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tun_init()
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{
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setvbuf(stdout, NULL, _IOLBF, 0); /* Line buffered output. */
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LOG_INFO("Initializing tun interface\n");
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tunfd = tun_alloc(config_tundev);
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if(tunfd == -1) {
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LOG_WARN("Failed to open tun device (you may be lacking permission). Running without network.\n");
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/* err(1, "failed to allocate tun device ``%s''", config_tundev); */
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return;
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}
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LOG_INFO("Tun open:%d\n", tunfd);
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select_set_callback(tunfd, &tun_select_callback);
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fprintf(stderr, "opened %s device ``/dev/%s''\n",
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"tun", config_tundev);
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atexit(cleanup);
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signal(SIGHUP, sigcleanup);
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signal(SIGTERM, sigcleanup);
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signal(SIGINT, sigcleanup);
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ifconf(config_tundev, config_ipaddr);
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}
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/*---------------------------------------------------------------------------*/
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static int
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tun_output(uint8_t *data, int len)
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{
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/* fprintf(stderr, "*** Writing to tun...%d\n", len); */
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if(tunfd != -1 && write(tunfd, data, len) != len) {
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err(1, "serial_to_tun: write");
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return -1;
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}
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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static int
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tun_input(unsigned char *data, int maxlen)
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{
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int size;
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if(tunfd == -1) {
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/* tun is not open */
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return 0;
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}
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if((size = read(tunfd, data, maxlen)) == -1) {
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err(1, "tun_input: read");
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}
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return size;
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}
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/*---------------------------------------------------------------------------*/
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static uint8_t
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output(const linkaddr_t *localdest)
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{
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LOG_DBG("SUT: %u\n", uip_len);
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if(uip_len > 0) {
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return tun_output(&uip_buf[UIP_LLH_LEN], uip_len);
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}
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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/* tun and slip select callback */
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/*---------------------------------------------------------------------------*/
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static int
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set_fd(fd_set *rset, fd_set *wset)
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{
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if(tunfd == -1) {
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return 0;
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}
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FD_SET(tunfd, rset);
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return 1;
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}
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/*---------------------------------------------------------------------------*/
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static void
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handle_fd(fd_set *rset, fd_set *wset)
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{
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int size;
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if(tunfd == -1) {
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/* tun is not open */
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return;
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}
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LOG_INFO("Tun6-handle FD\n");
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if(FD_ISSET(tunfd, rset)) {
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size = tun_input(&uip_buf[UIP_LLH_LEN], sizeof(uip_buf));
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LOG_DBG("TUN data incoming read:%d\n", size);
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uip_len = size;
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tcpip_input();
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}
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}
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#endif /* __CYGWIN_ */
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static void input(void)
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{
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/* should not happen */
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LOG_DBG("Tun6 - input\n");
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}
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const struct network_driver tun6_net_driver ={
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"tun6",
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tun_init,
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input,
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output
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};
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/*---------------------------------------------------------------------------*/
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